At college, the figure "101" often denotes an introductory course. These Web sites provide level 101 help on a variety of business, money and shopping topics.
Social media 101. Ladies Who Launch, a site for entrepreneurial women, has this explainer on the use of Facebook, Twitter, and other "social media" in building a business by extending your network, becoming widely accessible, and offering your expertise as a marketing tool.
Suite 101. The "101" in the name of this site based in Canada indicates its mission as a place to learn the basics of the hundreds of topics it covers. The writers get paid a share of the site's advertising revenue. Unusual topics include a primer on how to trade in debt, and articles cover such things as whom to tip on the holidays, how to cut expenses by taking cooking classes, and how to avoid loan sharks.